Telephone-service apparatus.



ITO-859,884. A PATENTED' JULY 9, 1907.

'TELEPHONE SERVICE APPARTUS.

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PATENTBD JULY 9, 1907.

U. S. JACKSON. TELEPHONE SERVICE APPARATUS.

APPLIOATION FILED AUG. 18. 1905.

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No. 859,884. I l PATENTE) vJULY 9, 19o?.

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TELEPHONE sBRvIoE APPARATUS. APPLICATION FILED 'UG. 18, 1905.

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UNITED STATES gPATENT oEEIoE. u

URIAII S. JACKSON, OF OSSIPEE, NEW HAMPSHIRE, ASSIGNOR TO THE SUPERIOR AUTOMATIC TELEPHONE CO., OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE. "n

I TELEPHONE-SERVICE APPARATUS.

Specification of Letters Patent.

Patented July 9, 1907.

Application tiled August 18,1905. Serial No. 274.781.

To all whom it 'may concern:

Be it known that I, URIAH S. JACKSON, a citizen of the United States, of Ossipee, in the county of Carroll and State of New Hampshire, have invented anew and useful Improvement in Telephone-Service Apparatus,

of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to what are known as two-wire (either two'wires or one wire and ground) party-line telephone systems and apparatus, and is characterized by the fact that the several telephones of the line are included in closed loops tapped in a normally closed calling7 circuit, and consequently are normally short-circuited. In mode of operation the calling circuit is, together with the loops in which the calling and called telephones are included, utilized as the talking circuit, all telephones other tlian the calling and called remaining short-circuited. Each telephone-station is equipped with a manually operable device to open the normally closed talking circuit at the calling station, and also with make-and-break Contact-mechanism the operation of which opens the talking circuit at the called station, whereby a talking circuit between the calling and called stations is established, all other telephones remaining short-circuited. To prevent the talking circuit, when' in use, from being cut into, interfered with, or listened into, the equipment of each station includes a lock-out means to lock from operation all stations except the two in use.

The invention and the means or accomplishing the purposes stated are fully hereinafter set forth. That which is regarded as new` will be set forth in the claims appended to the description.

In the accompanying drawings, illustrating an apparatus embodying the invention:-Figure l is an elevation of the inclosing box, the transmitting and receiving instruments and the batteries Fig. 2 shows the same parts, the door of the box being open thus displaying the interior construction of the operating parts; Figs. 3 and 4 show in elevation details of construction; Fig.

. 5 illustrates the method of working.

For obvious reasons some of the details are omitted and the reference letters are not all used.

In the drawings, the box is indicated byA and its cover by A1. The local telephone batteries are indicated by F-F and the bell-ringing battery by B.

tem, there are fourteen of these boxes, each of which is indicated by a numeral on the dial DfFigs. l and 2. A pointer D1 moves on the dial D and is made to indicate to the user that the desired or called box is in connection and its user may be communicated with.-

I will now describe the mechanism by which the calls are made: The lever S which may be called the winding lever is rigidly attached to the shaft S2, and the said shait S2 has fixed upon it a drum S7 and a notched wheel S4, as shown in Fig. 4; a coiled spring, one endet which is shown as S14, is attached to the post a, and the other end to the drum S7. A pawl S5 is 65 attached to the spur gear S11 and is constructed to engage with the said notched wheel S4, this arrangement allows the notched wheel to be turned, by the'depression of the winding lever S, in the direction of the arrow Z without turning the spur gear S9. This action of turning the notched wheel St and with it the drum S7 winds up the spring S14, as one end of it is attached to the drum S7, and it is evident that the reaction of the said spring will give motion to the spur gear S( in the opposite direction, that is, in the direction indicated by the arrow Z1. This action will take place whenever the lever S is depressed. The lever is returned to its normal position by the stress of the spring S14 Which also rotates the spur gear S6 in the direction of the arrow Z1.

The spur gear S6 communicates motion to the pinion T and the shaft C1, thence to the contact make-andbreak wheel C2, see Figs. 2 and 3. The train T1 T2 and T3 and the escapement device T1 T5 and TG have no function except to prevent the make-and-break wheel C2 from rotating too rapidly.

The number of contact points on the wheel C2, Fig.

3, is equal to the numerals or divisions on the dial D and to the number of the boxes in the system. A post AS15 extends downward from the make-and-break 90 wheel C2 and serves as a stop for said wheel as it comes in contact with the end S1 of the winding lever S when the said lever is in its normal position as indicated by dotted lines Fig. 3, and in full lines in Fig. 2; that is, the wheel C2 is stopped when it has brought the pointer` 95 D1 on the fixed dial D to 0 on said dial. i

To cause the make-and-break wheel C2 to stop when it has made a sulicient number of electrical contacts between the electrodes Z6 and Z7 to causetherequired l station to be called byithe action of the trunnion pinion D3 as will be explained, I have the following-des'cribed device. To the shaft C1, a ratchet wheel C3 is rigidly attached; this ratchet wheel has the same number of teeth that the contact wheel C2 has contact points; see Fig. 3. A disk C, see Figs. l and 3, also mounted on the shaft C1, but free to rotate upon it, has on its under side a pawl C1 mounted upon a stop pin C6; this stop pin extends below the pawl C4 and serves,

when it comes in contact With the hook on the end of the controlling and releasing lever C7, to hold the said disk C from further rotation. The said lever C7 is pivoted at C2. The rotatable disk C has a handle or knob C5 for turning and also an arrow or pointer C11 or indicating by the fixed dial G10 the number of the station to be called, that is, by turning the disk so that the arrow G2 will indicate the number ot` the station to be called, the pawl C1 will pass by a certain number of teeth on the ratchet C2 according to the station to be called, the locking lever C7 being lifted, to allow this operationz-and this action will take the stop pin (l1 so far away from the hook of the controlling lever C1 that the make-and-break contact wheel C2 may rotate, before being stopped by said hooks, suiiiciently to make the required number o electrical contacts to operate the trunnion pinion D3 to the extent required to open communication with the station desired. The above-described movements are dependent upon the action of the coiled spring S14 which operates the drum S2 and the spur gear wheel SG, and relate to the operation of the electric make-and-break electrodes ZG and Z7 which 1 will now describe together with their function.

The battery L is the line or calling circuit battery and is of that class that is known as the closed-circuit battery.l The circuit system consists of a normally closed circuit for operating the station-calling apparatus and closed local loop circuits for the telephone transmitters and receivers. This-circuit, dominating and causing the batteries F-F to act through their own circuit, may be described as follows: Starting from the battery L, Fig. 2, the main line L1 connects all of the station boxes in series as shown in Fig. 5. The relay circuits at and within the boxes are the same for all. One of these circuits will be described by reierence to Fig. 2. The line wire enters the binding post L2, thence by the wire Z Z1 Z2 to the relay magnet E, thence by Z3 Z1 to binding block Z5, thence to the spring electrode Z, to the spring electrode Z7 (when these electrodes are in contact), thence by wire ZS ZJ Z10 to binding plate Z11, thence by spring electrode Z12 thence (when the electrode Z12 is in contact) to contact block Z, to the wire Z1A1 Z15 to binding post L3, thence to line L1 to battery L. The action oi the last-described circuit on the local-calling circuit is as follows: The said local-calling circuit starts from the open circuit batteries F-F through the wires m m1 m2 to magnets at large M, Fig. 2 (see Fig. 4 and in dotted lines in Fig. 3), thence by m'1 to block m4, coiled-spring electrode to electrode plate E3 (attached to the armature E1, but insulated from it), thence to fixed plate m1 when armature E1 is released, thence by wire m7 m3 to batteries F-F. Through this circuit the step-by-step movement of the pinion wheel D11 is operated and movement is given to the pointer hand D1 on the fixed dial D. The electro-magnet M is energized by the current through the circuit from the batteries F-F. An armature M1 pivoted at n, Fig. 4, and retracted by the coiled spring n1 has attached a double-acting sliding pawl M2 having pawl points M4 M5. The action of the magnet when energized is to swing the pawl in one direction, and that of the spring n1 (when the magnet is not energized) to swing the said pawl in the other direction; this back-and-forth motion of the pawl M2 serves to give a step-by-step motion to the trunnion pinion D11. The trunnions oi this pinion are indicated by D4 D4. The pointer hand D1 is attached to the shaft D2 of the pinion D3 so that a back-and-orth motion o the double pawl M2 will cause the pointer hand D1`to move one division on the fixed dial D, that is, one back-and-orth completed motion of the said pawl will cause the pointer hand to move rom O77 to 1 and the next such motion from 1 to 2. One of these step-by-step motions takes place (caused by the batteries F-F) at each time a contact is made by the armature plate electrode E3 with the ixed electrode` plate m, that is, upon each release oi the armature E1 by the magnet E in the circuit of the line-closed circuit battery L.

The telephone circuit may be termed a closed supplemental or loop circuit from the circuit of the normally closed line or calling circuit battery, already described, and consists of the wire Z17, from the electrode Z7, the contact plate H1 the wire 112 Z111 to transmitter Z211, thence by wire Z21 Z22 Z23 to binding post R1, thence through receiver to binding post R2, wire Z21 to fixed plate H2, thence by wire Z25 Z211 Z27 Z22 to fixed plate Z111, wire Z11 Z15 to binding post L3, wire L4 to battery L, N orlnally, and when a telephone instrument is not iu use, contacts H and H2 are closed, and the talking circuit passing through. the instrument not in use has two paths, one from binding post L2 through relay E, contact springs ZG, Z1', spring Z12, block Z111, wire Z14 to binding post L11; the other from binding post L2 over same route to contact spring Z1, thence by wire Z, contact arms H, H2, wires Z25, Z211, Z27, Z22, block Z111, to binding post L2. Normally the current Will divide through both paths, but should a party not called remove his receiver from the hook, the first circuit will be opened at Z12, block Z13, the inner end of the receiver hook being withdrawn from contact Z12, and the current will then pass entirely through the second circuit. 1t will thus be observed that the springs Hf, H2 short circuit the reeeiver and transmitter of any instrument not called, and therefore prevent the talking circuit being listened into. There are two devices for breaking the circuit through the electrodes H1 H2 and establishing a telephone circuit through the plate electrode H1, wire Z18 Z111 to transmitter Z211, etc. r1"he first consists ofthe bent lever N N2 (pivoted at N1) controlled by the manually operable lever S. The upper end of this lever N, N2 except when lever S is in raised or initial position rests against the electrode H2 and will hold the same out of electrical contact with the other or plate electrode H1 for the reason that the bent lever N lN2 has a strong spring N3 which will force the end N2 upward and thus keep the contact point oi the electrode H2 away from the corresponding point of the plate electrode H1, thus keeping the telephone-loop circuit in use; but when the lever S is in its raised or normal resting position, then the pin S3 engages the lower arm N of the lever N N2, and thus causes the upper' arm N2 to be depressed, thus allowing the electrode H2 to make contact with the electrode H1 (see middle instrument, in Fig. 5) and short circuiting the local talking circuit. The other device for separating the electrodes H2 H1 consists ot a pin H on the pinion D:1 (see Fig. 3). This pin is so located that when the pointer hand D1 is on the number that indicates the number ot' the box in which it is placed then the short circuit at motion to the make-and-break Wheel C2.

contacts Hf, H2 is broken and the loop or telephone circuit is established and the telephone of this box can be used. The location of the pin H on the `pinion is different for each box: for instance, in box No. 1 the pin H is so placed that when No. l is called, it, the pin, will place the telephone circuit in use when the hand. is on No. 1. And in No. 6 the pin is so placed that it will place the loop or telephone circuit in use when the hand is on No. 6 of the dial, and so on.

A separate battery B is used for the bell of each station. The bell circuit and its connected parts may be described as follows: The wire b b1 b2 b3 b4 b5 b11'takes the current from the battery to the electrode B2, Fig. 2, and through the drop latch B4 to theelectrode B11 (when the said drop latch B4 is raised up by the latch H2), thence to the fixed electrode B3 and the wire b7 to the bell. The circuit is completed by the wire b8 b1 b111 Z211, switch plate Z112, contact pin D13, spring plate Z114, pin b15 (in the telephone hanging lever R2), spring plate b1, Wire b17 b18, back to battery B. 1t will be noticed that the above bell circuit may be cut or opened in three places, viz.: at the drop latch B4 when it is not held up by the action oi the pin H acting through the electrode H2; and at the switch Z112 when the push pin B5 is forced up by the user; and also by the telephone hanging lever R3, that is, when the lever is drawn up by its spring (as it will be when the telephone receiver R is taken off), the pin b15 will be out of contactavith the spring plates b14 and b1, The operation may be explained as follows, all the telephones being initially or normally short-circuited. 1l' user at station l wishes to call station 6 he turns disk C until stop-pin C is at 6 on dial C. Then. he depresses lever S winding up spring C14 and permitting lever N, N2 to open the short circuit and establish the telephone circuit at station l. The spring S14 gives This wheel C2 Will rotate until the pointer D1 has moved to No. 6 on the dial, that is, the double pawl M3 will have operated in all of the boxes and set all of the trunnion pinions ahead six numbers as has been explained. This action will cause the pin H of box No. 6 to break the contact between the electrodes H2 and H1 and thus cause the current to pass to the loop or talking circuit,I

that is, the current will pass through the electrode plate H1, wire 113 and 1111 to the transmitter Z211 thence through wire 121 Z22 and Z2:1 to telephone receiver post R1 and thence to the receiver R and the post R2, thence by wire Z24 to electrode plate H3, thence by wireZ25 Z2G Z27 and 12S to plate Z13, thence by 114115 to post L3 and to the closed circuit battery L, Thus the user at station l may communicate with station. No. 617 as desired. l

If We assume that the person calling is at station No. l, that is, the left-hand one on Fig. 5, his receiver R Will be placed in the loop circuit7 by the action of the lever S, which lie depresses at the outset. This depression of the lever S frees the lever N2 which in turn throws up the electrode H2, separating it from the contact-ledge formed at the lower end of the electrode H1, and breaks the short circuit and brings in the loop circuit, while at the station called (that is, the station on the right of Fig. 5) the step-by-step motion of the trunnion-wheel D3 will bring the pin H to such a position that it will lift up the electrode H2 and thus break the short circuit and bring the loop circuit into service of both the caller and the one called, and prevents short-circuiting of either telephone. The same movement of pin H will lclose the local ringing circuit at B3 B4, and the bell at the called station will continue to ring till the party called removes his receiver from .the hook, or until the calling party replaces his receiver on the hook.

'lhe mechanism at all the stations not in use is locked from operation by the hooked end S2 of lever S111 S11, which engages a pin S3 on lever S, preventing the 0peration of said lever S, until released therefrom, by finger S2 of the trunnion wheel D3 lifting arm S11 of the lever and withdrawing S9 from engagement with S3 and this occurs only when the index 1)/ is at "0.

To restore the apparatus to its normal condition, the user raises the outer end of the lever C7 by doing which he irees the pin C6 from the hook of the lever, and thus continue until the pin S15 comes in Contact with the end S1 of the lever S and thus stops all of the rotating parts with the pointer hand at 0 as desired.

From the foregoing description it will be observed that according to my invention the several telephones are included in closed loops tapped in a normally closed calling circuit and are normally short circuited. The equipment of each telephone at each party station includes a manually operable device which opens the normally closed short circuit and establishes the talking circuit of that station, and also with a make and break contact mechanism, the operation of which breaks or opens the short circuit at a selected or called station, establishing the talking circuit of that station, and the telephone loop circuits of the called and calling stations are then in circuit with the line circuit. All other telephones on the line are unaffected and remain short-circuited. Combined with the foregoing mech anisni, the equipment of each telephone is provided with a lockout means, whereby all the telephones except the calling and the called are locked out and cannot be operated, whereby the talking circuit between the calling and. called stations cannot be interrupted and listening in is prevented.

Claims.

1. In a telephone service apparatus a call device consisting of a circuit make-and-break wheel; a Winding lever the movement of which by the operator will incite a rotative movement in the said wheel; a step-bystep switch mechanism operated by said make-and-break wheel; an indicating disk having a pointer and stop pin attached; a Iixed dial having numbers so arranged that by setting the said pointer at any determined number, a telephonie connection is made with the station corresponding with the said number; and a let-oft lever' constructed to allow the moving parts to1 restore the entire apparatus to its normal condition, that is, with all the pointers at 0 substantially as and for the purpose set forth.

2. In a two wire party line telephone service apparatus, a ndrmally closed calling circuit, a plurality of telephones included in closed normally short circuited loops tapped in the calling circuit, a manually operable device at each telephone station adapted to break the normal short circuit and establish the talking circuit of that station, each telephone also provided with a make and break contact mechanism the operation of which breaks the short circuit at a called station and establishes the talking circuit of that station, substantially as described.

-allows the rotation of the make-and-break wheel C2 to 3. In a two wire party line telephone service appal phone station arranged to prevent operation of said manu ratus, a normally closed calling circuit, a plurality of teleally operable device of all the telephone stations. phones included in closed normally short circuited loops In testimony whereof, I have signed my name to this tapped in the calling circuit, a manually operable device at specification in th'e presence of two subscribing Witnesses, 5 each telephone station adapted to break the normal short on this 11th day of August A. D. 1905.

circuit and establish the talking -circuit of that station,

each telephone also provided with a make and break con-` URIAH S' JACKSON' tact mechanism the operation of which breaks the short4 Witnesses: circuit at a called station and'establishes the talking cir- FRANK G. PARKER,

10 cuit of that station, and a lock out means at each telef JOHN BUCKLER. 

